Lathe-dog.



P.A. ZIMMERMAN.

LATHE DOG.

APPLICATION FILED NOV. 20. 19151 Paitented Apr. 25,1916.

Perry Zfiflmerman UNTT STATES PATENT QFFICE,

Pisa-RY A. znvrMEaMAN', or SPRINGFIELD, omo, ASSIGNOIR r0 THE wns'rnnnrooi'. blND'MANUFAGTURING COMPANY, or SPRINGFIELD, 01110, A CORPORATIONor ome.

Specification of Letters Patent.

" LATHE-DOG.

" Application fi1ed'November-20,y1915. Serial No. 62,448.

To all u' hom it mayconbern: v iil'Befit known that I, PERRY A. Znmrnn-Mat, a citizen of the United States, residing at Springfield, in thccounty of Clark and State"of Ohio, have'invented certain new and u sefulImprovei'nents in Lathe-Dogs, of which the following is a specification,reference being had therein to the accompanying drawing. a

This invention relates to lathe dogs. I

Latliedogs as commonly constructed compriseiwork engaging screw, theheadof which projectsbeyond the edge of the dog andiswliable to,'andfrequently does, come in contact'with the person or clothing of theoperator and cause injury thereto. Further the work-engaging screw isthreaded directly intoijthebody of the dog, and when, asfreouentlyhappens, the threads are stripped fronipthedog it is necessaryeitherto ream out the opening and 'retap it and then use aalarger screw,or, where this cannot be done, to discard; the dog as a whole.

Thetobject of the present invention is, first,;=to provide a-safety dog,that is, one having no; projecting parts which are liable engage theperson or clothing of the ope eratorgand to this end it 1s a further0b]e(i3- of tl'ig ZlDVQl'ltlOILllO so construct and arrange the workengaging devicethat both the device itselfand its operating memberwilllie within the body ,ofthe. dog.

It also an object, of; the vinvention-to mountythe workengaging devicein the, dog without in the dog, thus enablingthework engaging deviceandits operating member, to be renewed "'therlby, lengthening the life ofthe g 1, I

, It is;also ari object ofthe invention to provide a 'dog of thischaracter which can.

bemianufactured at a low cost.

In the accompanying drawings, Figure 1'- 18 a perspective view. of aportion of a lathe 3 showin'gthe dog mounted thereon. Fig. 2

is a front elevation of the dog partly broken away and Fig.- 3 is alongitudinal sectional.

new taken through the guide opening for the wcrk'eng'aging device In thedevice shown in the accompanying drawings, I'have utilized a dog themain feat res of'construction ofwhich are well 1, whiclifiis preferablytapered toward one end an has" projecting from one surface the use ofscrew threaded openings knhwnt This dog comprises a body portionPatented Apr. 25, 1916 thereof, with an opening 3 to receive the.

work, which is usually elongated in form and is supported at its ends bythe lathe centers, the dog serving to rotate the same against a cuttingtool or other implement. In the ordinary constrpction of the dog. a workengaging screw'ls threaded into, the body of the dog, at that endthereof adjacent thefinger 2, and projects into the work receivingopening 3 to engage the work and clamp the dog firmly thereto. The headof this screw, however, projects beyond the edge of the dog with theobjectionable results above mentioned. It has been proposed toovercomethis' difiiculty in various ways,

--workho1ding device and its actuating member within the body of the dogso that there are no parts that project in an objectionable manner. Tothis end, I have provided in the body of the dog'la secondopening 4,which is here shown in th f()1l11 of an elongated slot extendingtransversely of the body portion of the dog, and arranged between thework receiving opening 3 and the supporting finger 2. IfThe body of thedog has formed therein, and extending longitudi anally thereof,aiguideway 5, which inter sects the second opening, or slot, 4 and hasslidably mounted therein a work engaging device 6' which. is preferablyin the form of arod having that portion thereof which e i- .tendsthrough'the second opcning,4, screw threaded. In the present device therod is screw threaded throughout its length, but this is not necessaryto the carrying out of the invention. Mounted upon the screw threadedportion of the work engaging device, and arranged within the slot 4: soas to beheld against-axial movement, is an actuating member 7, which inthe presentinstance comprises an ordinary nut. The slot 4 is of such asize and shape as to permit the nut, or actuating member, to be engagedby a wrench, or other implement suitable for operating thesame. The workengaging device,

or rod, 6 is free to move its guideway but is held against rotarymovement. Consequently, the rotation of the actuating member, or nut,will impart longitudinal movement to the work engaging device to move itinto and out of clamping engagement with the work which is in, theopening 3. The work engaging device may be held against rotary movementin any suitable iminncr, but in the construction here shown I haverecessed the body of the dog on opposite sides of the guideway 5, atthat end thereof adjacent the finger :2, as shown at 8, and have mountedin the adjacent end longitudinally in of the rod Ii a pin 9, the ends ofwhich project beyond the sides of the rod into the recs 'es in the bodyof the dog, thus holding the rod firmly against rotation, but ermittingthe same tohave a free longitudinal movement. 7

The operation of the device will be readily uinlerstood from theforegoing description, and it will be apparent that I have provided adog, the work engagingdevice of which does not project beyond the edgeof the dog in an objectionable manner at any point, and which can beactuated by a wrench, or other implement, in much the usual manner. lurthcr, it wi ll be apparent that the dog has all the strength andrigidity of the ordinary dog, and that it can be built at substantiallythe same cost as the ordinary dog, if not at a lower cost Any additionalwork which might be required in connection with the new features of thedog is offset by the saving due to its being unnecessary to screw threadthe guideway, as is customary in the ordinary dog. Further. it will beapparent that the work in the dog by the nut, or actuating member, andif the threads are stripped from either the nut or the work engagingdevice, or either of these devices is injured in any manner, it is onlynecessary to remove and retill place the injured member, or members,thus avoiding the necessity of discarding the dog as a whole and greatlylengthening the life oi the dog.

il hile l have shown and described one embodiment oi. my invention, Iwish it to be understood that I do not desire to be limited to the exactdetails of construction shown and described, as various modificationswithin the scope o the appended claims will occur to a person skilled inthe art.

Having now fully described my invention what I claim as new, and desireto secure by Letters Patent jet-- Zl. A lathe dog or the like comprisinga lnirly portion having a work receiving opening and also having asecond opening, a

' device extending through ing, mounted in said body idea of said secondopenone end eatending into said mg and also having a gaging deviceslidably engaging device is supported" work receiving opening, and apart mounted on said work engaging device within said second opening tocause longitudinal movement to be imparted thereto.

2. A lathe dog or the like, comprising a body portion having awork-receiving opensecond opening, a work-engaging device extendingthrou h said second opening, slidably mounted 111 said body portion onboth sides of said opening and having one end extending into saidwork-receiving opening, and a part mounted on said work-engaging devicewithin said second opening to cause longitudinal movement to be impartedthereto.

3. A lathe dog or the like comprising a body portion having a workreceiving opening and a second opening, and also having a guidewayformed therein, intersecting said second opening and leadin into saidWork receiving opening, a wor engaging device mounted in said guidewaying a screw threaded portion extending through said second opening, anda nut mounted on said screw threaded portion of said work engagingdevice in said second opening and held against axial movement, wherebythe rotationof said nu. will impart longitudinal movement to said workengaging device.

4. In a lathe dog or the like, tion having a work receiving a guidewayleading from one edge said body portion to said opening, said bodyportion also having a second opening intersecting said guideway, anon-rotatable work onmounted in said g'uideway and having ascrew-threaded portion extending into said second opening, and a nutmounted on said screw-threaded portion of said work engaging device insaid second opening and held against axial movement.

5. A lathe dog or the like comprising a body portion having a workreceiving opening and a second opening, a screw threaded work engagingdevice extending through said second opening into said work receivingopening and mounted for longitudinal movement in said body portion butheld against rotary movement therein, and anut mounted on said workengaging device within said second opening and held against axialmovement.

6. A lathe dog or the like comprising a body portion having a workreceiving opening and having a slot extending transversely thereofadjacent to said Work receiving opening, a guideway extending lengthwiseof said dog and intersecting said slot, :1 work engaging rod slidablymounted in said guideway, having one end adapted to enter said workreceiving opening and having that portion thereof which extends throu hsaid slot screw threaded, means to hold said a body poropenin and andhav- III rod against rotary movement, and a nut mounted on the screwthreaded portion of said rod within said slot and held against axialmovement.

7. A lathe dogbr the like comprising a body portion having a Workreceivlng opening and a second opening, and also having a guidewayintersecting said second opening and leading into said work receivingopening, a screw threaded work engagmg device slidably mounted in saidguideway, a

nut mounted on said screw threaded device within said opening and heldagainst axial movement, and a pin carried by said work engaging deviceand projecting beyond the sides thereof, said body portion of said dogbeing recessed on the opposite sides of said guideway to receive theprojecting portionsof said pin.

In testimony whereof, I afiix my signature hereto.

,c PERRY A. ZIMMERMAN.

